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How do you use another IP address?

If some one try to use my IP address,How can I identify his mac address? I am using CISCO ME-3400 as a L2 swi?

  • Actually, I am win xp user.I have h LAN in which if somebody try to use my IP address.I get an error message regarding IP conflict.I want to know what is the mac address of that intruder or is there any way to know about his/her machine identity? Thanks in advance.

  • Answer:

    An "IP Conflict" message doesn't nec mean someone else is using your MAC. It means they're using your IP. A symptom of this is to start a constant ping to far off device: ping x.x.x.x /t And if there is an IP conflict, you'll usually see your pings work for 10 to 20 seconds, then not work for 10 to 20 seconds. This is the ARP changing MAC addresses, depending one which deivces responds first. Easiest way to find the MAC of the offending device, is to 'sh ip arp x.x.x.x' on your Cisco router (not the switch). Repeat that command over and over until you see the MAC address change. Then use 'sh mac address H.H.H' and follow the L2 hop path until you find the host port where the offending device is connected.

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You're using the ME-3400 as a layer 2 switch. As such, it's not going to have IP-level awareness. One thing you can do is port-mirroring on the ME-3400so that you can intercept all traffic to a single interface, load a protocol analyzer such as Wireshark, and capture the relevant data on the network. From there, look for the traffic with the IP in question, and in the ethernet header you should see the source MAC address. With that, do a "show mac address table" command variant to find what port the traffic comes in on, and go from there.

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